package com.atguigu.day08;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.util.ArrayList;
import java.util.Comparator;

public class Flink03_KeyState_ListState {
    public static void main(String[] args) throws Exception {
        //1.获取流的执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        env.setParallelism(1);

        //2.从端口读取数据
        DataStreamSource<String> streamSource = env.socketTextStream("localhost", 9999);


        //3.将数据转为JavaBean
        SingleOutputStreamOperator<WaterSensor> waterSensorStream = streamSource.map(new MapFunction<String, WaterSensor>() {
            @Override
            public WaterSensor map(String value) throws Exception {
                String[] split = value.split(",");
                return new WaterSensor(split[0], Long.parseLong(split[1]), Integer.parseInt(split[2]));
            }
        });


        KeyedStream<WaterSensor, Tuple> keyedStream = waterSensorStream.keyBy("id");

        //针对每个传感器输出最高的3个水位值
        keyedStream.process(new KeyedProcessFunction<Tuple, WaterSensor, String>() {

            //TODO 1.定义状态
            private ListState<Integer> listState;

            @Override
            public void open(Configuration parameters) throws Exception {
                //TODO 2.初始化状态
                listState = getRuntimeContext().getListState(new ListStateDescriptor<Integer>("listState", Types.INT));
            }

            @Override
            public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {
                //0.将数据先写入状态
                listState.add(value.getVc());

                //1.取出状态中的值
                Iterable<Integer> integers = listState.get();

                //2.将迭代器中的数据取出来存入list集合
                ArrayList<Integer> listVcs = new ArrayList<>();
                for (Integer integer : integers) {
                    listVcs.add(integer);
                }

                //3.判断集合中的元素个数是否超过三个
                if (listVcs.size()>3){
                    //对集合中的元素做排序
                    listVcs.sort(new Comparator<Integer>() {
                        @Override
                        public int compare(Integer o1, Integer o2) {
                            return o2-o1;
                        }
                    });
                    listVcs.remove(3);
                    //更新状态
                    listState.update(listVcs);
                    out.collect(listVcs.toString());
                }else {
                    out.collect(listVcs.toString());
                }

            }
        }).print();

        env.execute();
    }
}
